100ms time delay rcd on main domestic unit?g

[cmp260]

my house has 100ms time delay rcd main switch. why would this have been installed in a house? is it legal?
thanks

 

[LlandrilloSpark]

Have you got anymore consumer units or RCD's on the same installation? Yes it's legal

 

[telectrix]

probably as it's a TT earthing system. a rough idea of when it was installed, has it got any 30mA RCDs?

 

[cmp260]

there is a 30mA Rcd half way down the bus
would this setup be acceptable for eicar or unsatisfactory?
also, there are two breakers which are lableled cooker and central heating, these are unused the wires go nowhere, , its lagacy of old house, cooker and ch are on kitchen ring now
should it fail eicar for this?
ta

 

[Steve_P]

I have one of those up front in my place!!!

Next door neighbour has one in his board on the side that controls the garage/workshop too.

 

[Octopus]

OK matey. What are you? A trainee, apprentice, DIYer or homeowner??

 

[Steve_P]

there is a 30mA Rcd half way down the bus
would this setup be acceptable for eicar or unsatisfactory?
also, there are two breakers which are lableled cooker and central heating, these are unused the wires go nowhere, , its lagacy of old house, cooker and ch are on kitchen ring now
should it fail eicar for this?
ta

So it controls nothing? Why would it be a fail on an EICR?

 

[cmp260]

worked in telcomms for many years matey, well up on electrics and hands on eletronics but not familiar with this stuff, dont worry im not diy, just wanna know exactly whats going on and dont wanna be taken for a ride by the bloke who failed my eicar,

 

[Steve_P]

Tell you what CMP mate, tell us all the facts and why you're asking and we can give you the why's and wherefores until then I'm off to the boozer. Bye.

 

[cmp260]

thats what i thought, if it controls nothing, why would it fail
is he taking the p*ss?

 

[MDJ]

dont worry im not diy,

Really? :38:

 

[LlandrilloSpark]

No he is not taking the pee

Unable to trace final circuit... if he has it as a c2 its a fail, c3 then not, i thought it was c2 but im not 100% sure, hence the edit

Fail.. End of story

 

[cmp260]

many thanks llandeilo, a straight answer
so is c2 fail and c3 pass?
and would unconnected but labeled breakers be c2 as well?

 

[Octopus]

I think you need to give us more info

Against each of the C1, C2 and C3 there should be a statement - can you list them?

And add in the one that covers your other thread too!!

 

[brman]

cmp, you really need to explain what you have a bit clearer....

a 100mA RCD main switch feeding a few MCBs and a 30mA RCD which then feeds the remainder of the MCBs?

Nothing obvious wrong with that so far.
2 MCBs where the "wires go nowhere". So their are cables to these MCBs? where does the other end go to? is it terminated properly?
If this isn't clear then I'd put it down as needing more investigation.

You appear to be implying that someone has done an EICR as unsatisfactory. If this is the case what are the codes and comments?

EDIT: oops, Murdoch can type faster

 

[LlandrilloSpark]

It should not be a satisfactory outcome(pass) with any C1 or C2 but you can issue a satisfactory eicr with C3's , but what your sparky determined as C2 or C3 is down to his experience and professional judgement

 

[Octopus]

Google the electrical safety council, and there are a number of leaflets on there that you may find useful.

 

[cmp260]

its the 100ms time delay i was wondering about on the 100mA trip

sorry gota give my kids dinner now, will reply lare with list as req

 

[cmp260]

sorry feeding kids now, will reply later
many thanks

 

[telectrix]

there's nowt wrong with a 100mA delay RCD as main switch. as long as there's a 30mA RCD covering sockets for general use ( assuming the installation was done to the 16th ed. prior to 2008 when RCDs were specified for more circuits, then that would just be a code C3 ( non-compliance with current regs.) and that is NOT a fail. code C1 is a real and immediate dasnger of fire, injury or death. code C2 is a potentialo danger ......... both these are fails. a C3 is not.

 

[Des 56]

He has not described the installation
He has not outlined what has been highlighted by the inspector
Yet He wants to know if the consequences of an inspection are correct

Replies have asked for this sort of information whilst giving general views on Rcd protection,why so ?


He either supplies this information or this thread is a complete waste of all your time
:waving:

 

[cmp260]

high impedance on 25 on circuits 2 and 3
unable to locate cooker circuit
unable to locate water bond -no continuity to earth
100 ma TD main switch
unable to locate heating circuit
wrong size mcb on cooker circuit 40A
wrong size mcb on shower circuit with 6mm cable 50A

all these have code c2

im a bit annoyed since..
we no longer have an electric shower it runs off the combi boiler,
we have a gas hob, and the fan oven is rated low enoug for the kitchen ring,
the cooker circuit serves nothing

 

[trev]

high impedance on 25 on circuits 2 and 3
unable to locate cooker circuit
unable to locate water bond -no continuity to earth
100 ma TD main switch
unable to locate heating circuit
wrong size mcb on cooker circuit 40A
wrong size mcb on shower circuit with 6mm cable 50A

all these have code c2

im a bit annoyed since..
we no longer have an electric shower it runs off the combi boiler,
we have a gas hob, and the fan oven is rated low enoug for the kitchen ring,
the cooker circuit serves nothing

Unable to locate cooker circuit but it's on an incorrectly rated MCB?
I'm at a loss to understand why he would code an S type RCD as a C2
What does "high impedance on 25" mean?

 

[GLENNSPARK]

there is a 30mA Rcd half way down the bus
would this setup be acceptable for eicar or unsatisfactory?
also, there are two breakers which are lableled cooker and central heating, these are unused the wires go nowhere, , its lagacy of old house, cooker and ch are on kitchen ring now
should it fail eicar for this?
ta

you say the `wires go noware`...if so...have these cables been taken out of the terminations at the board?

o

 

[saveloy]

Unable to locate cooker circuit but it's on an incorrectly rated MCB?
I'm at a loss to understand why he would code an S type RCD as a C2
What does "high impedance on 25" mean?

Maybe high impedance on ZS.

 

[brman]

> high impedance on 25 on circuits 2 and 3
should show on the test schedule what the Zs is for those circuits. that, against the mcb ratings will say what the problem is.

>unable to locate cooker circuit
reasonable if there are actually cables going to it. easy enough to fix by disconnecting..

>unable to locate water bond -no continuity to earth
so he is saying it didn't measure out properly?

>100 ma TD main switch
based on that info - no fault....

>unable to locate heating circuit
as cooker

> wrong size mcb on cooker circuit 40A
> wrong size mcb on shower circuit with 6mm cable 50A
disconnected there would be no problem

I have to admit that most of this would have been easily sorted by disconnecting the unused circuits at the time the inspection was done......

 

[Octopus]

high impedance on 25 on circuits 2 and 3
unable to locate cooker circuit
unable to locate water bond -no continuity to earth
100 ma TD main switch
unable to locate heating circuit
wrong size mcb on cooker circuit 40A
wrong size mcb on shower circuit with 6mm cable 50A

all these have code c2

im a bit annoyed since..
we no longer have an electric shower it runs off the combi boiler,
we have a gas hob, and the fan oven is rated low enoug for the kitchen ring,
the cooker circuit serves nothing

But puzzled by first point - can you email him and ask for an explanation? On the schedule of test reults what are the readings for the Zs for these circuits???
I thought you said in your other thread he'd installed bonding to the water.
100 Ma TD main switch - not sure that's a code at all
Rest could be C2's but they are hardly costly to put right and yes the "unable to locate" circuits is harsh but correct

You asked for a EICR, so do you expect a "satisfactory" if there are issues?

Your footnote is largely irrelevent, imho

 

[CDM]

If there are two unknown circuits,I would advise that they should be isolated.Cables removed from the consumer unit and your cert will come out clean.

 

[Steve_P]

Damn it you lot can type faster than me.

Ok so bonding needs to be confirmed but by the sounds of that, most of it shouldn't take long to sort. Is the sparky really an spark? Sounds like some bloke from the pub or a Electrical Trainee just out of day release.

high impedance on 25 on circuits 2 and 3 - can't comment on this, what are these circuits? What are the results?
unable to locate cooker circuit - so disconnect it.
unable to locate water bond -no continuity to earth - that should be sorted . . . . .
100 ma TD main switch - again, doesn't mean a lot as a statement on its own.
unable to locate heating circuit - do you have heaters / a heating system? If not, dosconnect it.
wrong size mcb on cooker circuit 40A - this is the circuit that he can't locate then?
wrong size mcb on shower circuit with 6mm cable 50A - ok, the breaker is OTT so why can't the shower go into the breaker that the cooker isn't on? Depends on the shower of course but seems obvious.

we no longer have an electric shower it runs off the combi boiler, - This is probably cheaper than the electric shower, it's what I've got.
we have a gas hob, and the fan oven is rated low enoug for the kitchen ring, - what is the rating of the hob?



Without seeing the installation and the certificate and probably some photo's it's difficult to comment really. If this guy is actually an electrician there will almost certainly be a reasoning behind what has been said. Is there something that we're not being told?

 

[trev]

Maybe high impedance on ZS.

Aye, could be mate